package com.demo.yarn.mr2;

import  java.io.*;

import com.demo.util.RandomUtil;
import org.apache.hadoop.*;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.Mapper;
import org.apache.hadoop.mapreduce.Reducer;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
import org.apache.hadoop.util.GenericOptionsParser;
/*
文件复制
 */
public class FileRedunplication {
    public static class Map extends Mapper<Object,Text,Text,Text>{
        private static Text line = new Text();
        public void map(Object key, Text value, Context context)throws IOException,InterruptedException
        {
            line = value;
            context.write(line, new Text(""));
        }
    }

    public static class Reduce extends Reducer<Text,Text,Text,Text>
    {
        public void reduce(Text key, Iterable <Text>values, Context context) throws IOException, InterruptedException
        {
            context.write(key, new Text(""));
        }
    }
    public static void main(String[] args) throws Exception
    {
        Configuration conf = new Configuration();
        //conf.set("mapred.job.tracker","192.168.1.2:9001");
//        String[] ioArgs = new String[]{"data.txt","databack.txt"};
//        String[] otherArgs = new GenericOptionsParser(conf,ioArgs).getRemainingArgs();
//        if(otherArgs.length!= 2)
//        {
//            System.err.println("Usage:Data redunplication <in><out>");
//            System.exit(2);
//        }
        Job job = new Job(conf,"Data Redunplication");
        job.setJarByClass(FileRedunplication.class);
        job.setMapperClass(Map.class);
        job.setReducerClass(Reduce.class);
        //job.setCombinerClass(Reduce.class);
        job.setOutputKeyClass(Text.class);
        job.setOutputValueClass(Text.class);

        FileInputFormat.addInputPath(job, new Path(args[0]));
        FileOutputFormat.setOutputPath(job, new Path(args[1]+ RandomUtil.nowstr()));
        System.exit(job.waitForCompletion(true)?0:1);

    }
}
